Season 6 Episode 3
Episode aired october 09, 2001
buffy and her friends battle a demon that may have hitched a ride with buffy as she crossed into the world from another dimension.
the scene in which anya is possessed by the demon ghost and slashes her face several times while laughing maniacally was trimmed by skyone for the uk broadcast to show her laughing and then collapsing, editing out the face-slashing.